public class jiaoone {
    public static void main(String[] args) {
        int [] arr={1,2,3,4,5};
        for(int i=0 , j=arr.length-1 ; i<j ; i++,j--){
            int temp=arr[i];
            arr[i]=arr[j];
            arr[j]=temp;
        }
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i]+" ");
        }
    }
}
